Whats a good place to start for jetting ?

[2000]

I have a warrior with a fmf powerbomb header and power core 4 exhaust and k&n air filter with the stock lid. Wheres a good place to start the guy who had it before me supposedly rejected but it studders on the low end around 1/8 to 1/4 throttle. after that it runs great. So where should I start?

 

[frit91]

Do a plug chop at 1/4 throttle to see if it is lean or rich first, use a new plug. Idle to 1/4 throttle is controlled by the pilot jet. Stock pilot is 42.5. If it is lean see what size you have in it and if it is 42.5 move up to a 45. Turn the air fuel screw all the way in til it lightly seats then turn it out about 1 1/2 to 2 turns and see how it runs and adjust from there.

 

[hashish420]

my air screw is at 2.75 turns out is that ok? i have some huge pipe on there

 

[1998yamahawarrior]

Before Id even do plug chops Id see what you have in there already. 1 that will tell you if its been jetted at all before and while you are in there you can clean the carb, so your fueling is consistent during the plug chops.